Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 11 22.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(LANDSAT-9) LANDSAT-9 Lat/Lon    Distance(km)  Time Diff(sec)
 11/22/2023   15:17:59   ( -70.95, 125.08) 11/22/2023   15:19:05  ( -70.80, 127.73)   97.69                66
 11/22/2023   16:08:25   (  69.89, -65.94) 11/22/2023   16:08:47  (  69.88, -65.97)    1.53                22
 11/22/2023   16:59:07   ( -69.79, 101.53) 11/22/2023   16:58:17  ( -69.77, 101.51)    2.37                50
 11/25/2023   07:34:38   ( -70.02,-117.68) 11/25/2023   07:35:49  ( -70.03,-117.54)    5.43                71
 11/25/2023   08:25:21   (  69.86,  49.87) 11/25/2023   08:25:17  (  69.87,  49.88)    1.10                 4
 11/25/2023   09:16:01   ( -69.65,-142.51) 11/25/2023   09:14:48  ( -69.71,-142.71)    9.75                73
 11/27/2023   23:51:34   ( -69.94,  -1.80) 11/27/2023   23:52:21  ( -69.93,  -1.80)    1.37                47
 11/28/2023   00:42:18   (  69.84, 165.67) 11/28/2023   00:41:48  (  69.82, 165.69)    1.95                30
 11/30/2023   15:18:02   (  70.72, -54.57) 11/30/2023   15:19:10  (  70.62, -52.55)   75.02                68
 11/30/2023   16:08:31   ( -69.93, 113.99) 11/30/2023   16:08:51  ( -69.91, 114.05)    3.02                20
 11/30/2023   16:59:14   (  69.77, -78.47) 11/30/2023   16:58:18  (  69.80, -78.46)    3.32                56
 12/03/2023   07:34:45   (  69.98,  62.36) 12/03/2023   07:35:51  (  69.96,  62.37)    1.33                66
 12/03/2023   08:25:27   ( -69.87,-130.16) 12/03/2023   08:25:21  ( -69.86,-130.14)    1.04                 6
 12/03/2023   09:16:04   (  69.39,  37.84) 12/03/2023   09:14:53  (  69.47,  36.97)   34.91                71
 12/05/2023   23:51:40   (  69.93, 178.20) 12/05/2023   23:52:19  (  69.94, 178.22)    1.27                39
 12/06/2023   00:42:22   ( -69.82, -14.32) 12/06/2023   00:41:49  ( -69.84, -14.29)    2.51                33